904 Breakaway Torque Converter

The 904 Breakaway Torque Converter is a precision-engineered transmission component designed for high-performance Torqueflite 904 and 988 automatic transmissions. Built for serious enthusiasts and professional rebuilders who demand reliable, repeatable stall characteristics, this breakaway converter delivers the controlled engagement needed for both street and controlled acceleration applications. The 2400–2600 RPM stall range positions this converter as a versatile choice for moderate power builds where engine responsiveness and transmission durability must coexist.

The breakaway design allows the converter to unlock and slip at a calibrated RPM band, reducing heat buildup and extending transmission fluid life during highway driving while preserving the launch advantage needed for controlled acceleration. This hybrid behavior—combining stall torque multiplication with mechanical lockup—is particularly effective in small- to mid-displacement engines where excessive converter slip would rob efficiency. Weighing 31.75 pounds, the 904 Breakaway maintains OEM balance characteristics essential for driveline harmony and crankshaft longevity, ensuring installation into existing Torqueflite 904 or 988 transmissions requires no counterweight adjustments.

Transmission rebuilders and street performance builders benefit most from this converter's predictable engagement and thermal efficiency. Installation into a Torqueflite 904 or 988 is direct; bolt orientation and pump-to-turbine clearance follow OEM specifications. For users stepping up from stock converters, the 2400–2600 RPM stall will noticeably improve off-idle throttle response without the extreme heat penalties of higher-stall units, making it the pragmatic choice for drivers seeking weekend performance and weekday reliability. Proper transmission fluid, cooler sizing, and linkage adjustment remain essential for optimal service life.